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LilaNeiymar
@LilaNeiymar
April 2019
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DEF est un triangle rectangle en E tel que x = 62° et EF = 4 cm.
Calculer la longueur de [DE].
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MathsEtDessin
Dans le triangle EDF(vous me faites suer LOL!) rectangle en E
tan(FDE) = EF/DE
tan(62) = 4/DE
DE = 4 x 1/tan(62) = 2,13 cm
VOILA !
3 votes
Thanks 4
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tan(FDE) = EF/DE
tan(62) = 4/DE
DE = 4 x 1/tan(62) = 2,13 cm
VOILA !